bin/ksh/sh.h

   1 /*      $OpenBSD: sh.h,v 1.73 2018/05/18 13:25:20 benno Exp $   */
   2
   3 /*
   4  * Public Domain Bourne/Korn shell
   5  */
   6
   7 /* $From: sh.h,v 1.2 1994/05/19 18:32:40 michael Exp michael $ */
   8
   9 #include "config.h"     /* system and option configuration info */
  10
  11 /* Start of common headers */
  12
  13 #include <limits.h>
  14 #include <setjmp.h>
  15 #include <stdarg.h>
  16 #include <stddef.h>
  17 #include <signal.h>
  18 #include <stdbool.h>
  19
  20 /* end of common headers */
  21
  22 #define NELEM(a) (sizeof(a) / sizeof((a)[0]))
  23 #define BIT(i)  (1<<(i))        /* define bit in flag */
  24
  25 #define NUFILE  32              /* Number of user-accessible files */
  26 #define FDBASE  10              /* First file usable by Shell */
  27
  28 #define BITS(t) (CHAR_BIT * sizeof(t))
  29
  30 /* Make MAGIC a char that might be printed to make bugs more obvious, but
  31  * not a char that is used often.  Also, can't use the high bit as it causes
  32  * portability problems (calling strchr(x, 0x80|'x') is error prone).
  33  */
  34 #define MAGIC           (7)     /* prefix for *?[!{,} during expand */
  35 #define ISMAGIC(c)      ((unsigned char)(c) == MAGIC)
  36
  37 #define LINE    4096            /* input line size */
  38
  39 extern  const char *kshname;    /* $0 */
  40 extern  pid_t   kshpid;         /* $$, shell pid */
  41 extern  pid_t   procpid;        /* pid of executing process */
  42 extern  uid_t   ksheuid;        /* effective uid of shell */
  43 extern  int     exstat;         /* exit status */
  44 extern  int     subst_exstat;   /* exit status of last $(..)/`..` */
  45 extern  const char *safe_prompt; /* safe prompt if PS1 substitution fails */
  46 extern  char    username[];     /* username for \u prompt expansion */
  47
  48 /*
  49  * Area-based allocation built on malloc/free
  50  */
  51 typedef struct Area {
  52         struct link *freelist;  /* free list */
  53 } Area;
  54
  55 extern  Area    aperm;          /* permanent object space */
  56 #define APERM   &aperm
  57 #define ATEMP   &genv->area
  58
  59 #ifdef KSH_DEBUG
  60 # define kshdebug_init()        kshdebug_init_()
  61 # define kshdebug_printf(a)     kshdebug_printf_ a
  62 # define kshdebug_dump(a)       kshdebug_dump_ a
  63 #else /* KSH_DEBUG */
  64 # define kshdebug_init()
  65 # define kshdebug_printf(a)
  66 # define kshdebug_dump(a)
  67 #endif /* KSH_DEBUG */
  68
  69 /*
  70  * parsing & execution environment
  71  */
  72 struct env {
  73         short   type;                   /* environment type - see below */
  74         short   flags;                  /* EF_* */
  75         Area    area;                   /* temporary allocation area */
  76         struct  block *loc;             /* local variables and functions */
  77         short  *savefd;                 /* original redirected fd's */
  78         struct  env *oenv;              /* link to previous environment */
  79         sigjmp_buf jbuf;                /* long jump back to env creator */
  80         struct temp *temps;             /* temp files */
  81 };
  82 extern  struct env      *genv;
  83
  84 /* struct env.type values */
  85 #define E_NONE  0               /* dummy environment */
  86 #define E_PARSE 1               /* parsing command # */
  87 #define E_FUNC  2               /* executing function # */
  88 #define E_INCL  3               /* including a file via . # */
  89 #define E_EXEC  4               /* executing command tree */
  90 #define E_LOOP  5               /* executing for/while # */
  91 #define E_ERRH  6               /* general error handler # */
  92 /* # indicates env has valid jbuf (see unwind()) */
  93
  94 /* struct env.flag values */
  95 #define EF_FUNC_PARSE   BIT(0)  /* function being parsed */
  96 #define EF_BRKCONT_PASS BIT(1)  /* set if E_LOOP must pass break/continue on */
  97 #define EF_FAKE_SIGDIE  BIT(2)  /* hack to get info from unwind to quitenv */
  98
  99 /* Do breaks/continues stop at env type e? */
 100 #define STOP_BRKCONT(t) ((t) == E_NONE || (t) == E_PARSE \
 101                          || (t) == E_FUNC || (t) == E_INCL)
 102 /* Do returns stop at env type e? */
 103 #define STOP_RETURN(t)  ((t) == E_FUNC || (t) == E_INCL)
 104
 105 /* values for siglongjmp(e->jbuf, 0) */
 106 #define LRETURN 1               /* return statement */
 107 #define LEXIT   2               /* exit statement */
 108 #define LERROR  3               /* errorf() called */
 109 #define LLEAVE  4               /* untrappable exit/error */
 110 #define LINTR   5               /* ^C noticed */
 111 #define LBREAK  6               /* break statement */
 112 #define LCONTIN 7               /* continue statement */
 113 #define LSHELL  8               /* return to interactive shell() */
 114 #define LAEXPR  9               /* error in arithmetic expression */
 115
 116 /* option processing */
 117 #define OF_CMDLINE      0x01    /* command line */
 118 #define OF_SET          0x02    /* set builtin */
 119 #define OF_SPECIAL      0x04    /* a special variable changing */
 120 #define OF_INTERNAL     0x08    /* set internally by shell */
 121 #define OF_ANY          (OF_CMDLINE | OF_SET | OF_SPECIAL | OF_INTERNAL)
 122
 123 struct option {
 124     const char  *name;  /* long name of option */
 125     char        c;      /* character flag (if any) */
 126     short       flags;  /* OF_* */
 127 };
 128 extern const struct option sh_options[];
 129
 130 /*
 131  * flags (the order of these enums MUST match the order in misc.c(options[]))
 132  */
 133 enum sh_flag {
 134         FEXPORT = 0,    /* -a: export all */
 135         FBRACEEXPAND,   /* enable {} globbing */
 136         FBGNICE,        /* bgnice */
 137         FCOMMAND,       /* -c: (invocation) execute specified command */
 138         FCSHHISTORY,    /* csh-style history enabled */
 139 #ifdef EMACS
 140         FEMACS,         /* emacs command editing */
 141 #endif
 142         FERREXIT,       /* -e: quit on error */
 143 #ifdef EMACS
 144         FGMACS,         /* gmacs command editing */
 145 #endif
 146         FIGNOREEOF,     /* eof does not exit */
 147         FTALKING,       /* -i: interactive */
 148         FKEYWORD,       /* -k: name=value anywhere */
 149         FLOGIN,         /* -l: a login shell */
 150         FMARKDIRS,      /* mark dirs with / in file name completion */
 151         FMONITOR,       /* -m: job control monitoring */
 152         FNOCLOBBER,     /* -C: don't overwrite existing files */
 153         FNOEXEC,        /* -n: don't execute any commands */
 154         FNOGLOB,        /* -f: don't do file globbing */
 155         FNOHUP,         /* -H: don't kill running jobs when login shell exits */
 156         FNOLOG,         /* don't save functions in history (ignored) */
 157         FNOTIFY,        /* -b: asynchronous job completion notification */
 158         FNOUNSET,       /* -u: using an unset var is an error */
 159         FPHYSICAL,      /* -o physical: don't do logical cd's/pwd's */
 160         FPOSIX,         /* -o posix: be posixly correct */
 161         FPRIVILEGED,    /* -p: use suid_profile */
 162         FRESTRICTED,    /* -r: restricted shell */
 163         FSH,            /* -o sh: favor sh behaviour */
 164         FSTDIN,         /* -s: (invocation) parse stdin */
 165         FTRACKALL,      /* -h: create tracked aliases for all commands */
 166         FVERBOSE,       /* -v: echo input */
 167 #ifdef VI
 168         FVI,            /* vi command editing */
 169         FVIRAW,         /* always read in raw mode (ignored) */
 170         FVISHOW8,       /* display chars with 8th bit set as is (versus M-) */
 171         FVITABCOMPLETE, /* enable tab as file name completion char */
 172         FVIESCCOMPLETE, /* enable ESC as file name completion in command mode */
 173 #endif
 174         FXTRACE,        /* -x: execution trace */
 175         FTALKING_I,     /* (internal): initial shell was interactive */
 176         FNFLAGS /* (place holder: how many flags are there) */
 177 };
 178
 179 #define Flag(f) (shell_flags[(int) (f)])
 180
 181 extern  char shell_flags[FNFLAGS];
 182
 183 extern  char    null[]; /* null value for variable */
 184
 185 enum temp_type {
 186         TT_HEREDOC_EXP, /* expanded heredoc */
 187         TT_HIST_EDIT    /* temp file used for history editing (fc -e) */
 188 };
 189 typedef enum temp_type Temp_type;
 190 /* temp/heredoc files.  The file is removed when the struct is freed. */
 191 struct temp {
 192         struct temp     *next;
 193         struct shf      *shf;
 194         int             pid;            /* pid of process parsed here-doc */
 195         Temp_type       type;
 196         char            *name;
 197 };
 198
 199 /*
 200  * stdio and our IO routines
 201  */
 202
 203 #define shl_spare       (&shf_iob[0])   /* for c_read()/c_print() */
 204 #define shl_stdout      (&shf_iob[1])
 205 #define shl_out         (&shf_iob[2])
 206 extern int shl_stdout_ok;
 207
 208 /*
 209  * trap handlers
 210  */
 211 typedef struct trap {
 212         int     signal;         /* signal number */
 213         const char *name;       /* short name */
 214         const char *mess;       /* descriptive name */
 215         char   *trap;           /* trap command */
 216         volatile sig_atomic_t set; /* trap pending */
 217         int     flags;          /* TF_* */
 218         sig_t cursig;           /* current handler (valid if TF_ORIG_* set) */
 219         sig_t shtrap;           /* shell signal handler */
 220 } Trap;
 221
 222 /* values for Trap.flags */
 223 #define TF_SHELL_USES   BIT(0)  /* shell uses signal, user can't change */
 224 #define TF_USER_SET     BIT(1)  /* user has (tried to) set trap */
 225 #define TF_ORIG_IGN     BIT(2)  /* original action was SIG_IGN */
 226 #define TF_ORIG_DFL     BIT(3)  /* original action was SIG_DFL */
 227 #define TF_EXEC_IGN     BIT(4)  /* restore SIG_IGN just before exec */
 228 #define TF_EXEC_DFL     BIT(5)  /* restore SIG_DFL just before exec */
 229 #define TF_DFL_INTR     BIT(6)  /* when received, default action is LINTR */
 230 #define TF_TTY_INTR     BIT(7)  /* tty generated signal (see j_waitj) */
 231 #define TF_CHANGED      BIT(8)  /* used by runtrap() to detect trap changes */
 232 #define TF_FATAL        BIT(9)  /* causes termination if not trapped */
 233
 234 /* values for setsig()/setexecsig() flags argument */
 235 #define SS_RESTORE_MASK 0x3     /* how to restore a signal before an exec() */
 236 #define SS_RESTORE_CURR 0       /* leave current handler in place */
 237 #define SS_RESTORE_ORIG 1       /* restore original handler */
 238 #define SS_RESTORE_DFL  2       /* restore to SIG_DFL */
 239 #define SS_RESTORE_IGN  3       /* restore to SIG_IGN */
 240 #define SS_FORCE        BIT(3)  /* set signal even if original signal ignored */
 241 #define SS_USER         BIT(4)  /* user is doing the set (ie, trap command) */
 242 #define SS_SHTRAP       BIT(5)  /* trap for internal use (CHLD,ALRM,WINCH) */
 243
 244 #define SIGEXIT_        0       /* for trap EXIT */
 245 #define SIGERR_         NSIG    /* for trap ERR */
 246
 247 extern  volatile sig_atomic_t trap;     /* traps pending? */
 248 extern  volatile sig_atomic_t intrsig;  /* pending trap interrupts command */
 249 extern  volatile sig_atomic_t fatal_trap;       /* received a fatal signal */
 250 extern  volatile sig_atomic_t got_sigwinch;
 251 extern  Trap    sigtraps[NSIG+1];
 252
 253 /*
 254  * TMOUT support
 255  */
 256 /* values for ksh_tmout_state */
 257 enum tmout_enum {
 258         TMOUT_EXECUTING = 0,    /* executing commands */
 259         TMOUT_READING,          /* waiting for input */
 260         TMOUT_LEAVING           /* have timed out */
 261 };
 262 extern unsigned int ksh_tmout;
 263 extern enum tmout_enum ksh_tmout_state;
 264
 265 /* For "You have stopped jobs" message */
 266 extern int really_exit;
 267
 268 /*
 269  * fast character classes
 270  */
 271 #define C_ALPHA  BIT(0)         /* a-z_A-Z */
 272 /* was  C_DIGIT */
 273 #define C_LEX1   BIT(2)         /* \0 \t\n|&;<>() */
 274 #define C_VAR1   BIT(3)         /* *@#!$-? */
 275 #define C_IFSWS  BIT(4)         /* \t \n (IFS white space) */
 276 #define C_SUBOP1 BIT(5)         /* "=-+?" */
 277 #define C_SUBOP2 BIT(6)         /* "#%" */
 278 #define C_IFS    BIT(7)         /* $IFS */
 279 #define C_QUOTE  BIT(8)         /*  \n\t"#$&'()*;<>?[\`| (needing quoting) */
 280
 281 extern  short ctypes [];
 282
 283 #define ctype(c, t)     !!(ctypes[(unsigned char)(c)]&(t))
 284 #define letter(c)       ctype(c, C_ALPHA)
 285 #define digit(c)        isdigit((unsigned char)(c))
 286 #define letnum(c)       (ctype(c, C_ALPHA) || isdigit((unsigned char)(c)))
 287
 288 extern int ifs0;        /* for "$*" */
 289
 290 /* Argument parsing for built-in commands and getopts command */
 291
 292 /* Values for Getopt.flags */
 293 #define GF_ERROR        BIT(0)  /* call errorf() if there is an error */
 294 #define GF_PLUSOPT      BIT(1)  /* allow +c as an option */
 295 #define GF_NONAME       BIT(2)  /* don't print argv[0] in errors */
 296
 297 /* Values for Getopt.info */
 298 #define GI_MINUS        BIT(0)  /* an option started with -... */
 299 #define GI_PLUS         BIT(1)  /* an option started with +... */
 300 #define GI_MINUSMINUS   BIT(2)  /* arguments were ended with -- */
 301
 302 typedef struct {
 303         int             optind;
 304         int             uoptind;/* what user sees in $OPTIND */
 305         char            *optarg;
 306         int             flags;  /* see GF_* */
 307         int             info;   /* see GI_* */
 308         unsigned int    p;      /* 0 or index into argv[optind - 1] */
 309         char            buf[2]; /* for bad option OPTARG value */
 310 } Getopt;
 311
 312 extern Getopt builtin_opt;      /* for shell builtin commands */
 313 extern Getopt user_opt;         /* parsing state for getopts builtin command */
 314
 315 /* This for co-processes */
 316
 317 typedef int Coproc_id; /* something that won't (realistically) wrap */
 318 struct coproc {
 319         int     read;           /* pipe from co-process's stdout */
 320         int     readw;          /* other side of read (saved temporarily) */
 321         int     write;          /* pipe to co-process's stdin */
 322         Coproc_id id;           /* id of current output pipe */
 323         int     njobs;          /* number of live jobs using output pipe */
 324         void    *job;           /* 0 or job of co-process using input pipe */
 325 };
 326 extern struct coproc coproc;
 327
 328 /* Used in jobs.c and by coprocess stuff in exec.c */
 329 extern sigset_t         sm_default, sm_sigchld;
 330
 331 extern const char ksh_version[];
 332
 333 /* name of called builtin function (used by error functions) */
 334 extern char     *builtin_argv0;
 335 extern int      builtin_flag;   /* flags of called builtin (SPEC_BI, etc.) */
 336
 337 /* current working directory, and size of memory allocated for same */
 338 extern char     *current_wd;
 339 extern int      current_wd_size;
 340
 341 /* Minimum required space to work with on a line - if the prompt leaves less
 342  * space than this on a line, the prompt is truncated.
 343  */
 344 #define MIN_EDIT_SPACE  7
 345 /* Minimum allowed value for x_cols: 2 for prompt, 3 for " < " at end of line
 346  */
 347 #define MIN_COLS        (2 + MIN_EDIT_SPACE + 3)
 348 extern  int     x_cols; /* tty columns */
 349
 350 /* These to avoid bracket matching problems */
 351 #define OPAREN  '('
 352 #define CPAREN  ')'
 353 #define OBRACK  '['
 354 #define CBRACK  ']'
 355 #define OBRACE  '{'
 356 #define CBRACE  '}'
 357
 358 /* Determine the location of the system (common) profile */
 359 #define KSH_SYSTEM_PROFILE "/etc/profile"
 360
 361 /* Used by v_evaluate() and setstr() to control action when error occurs */
 362 #define KSH_UNWIND_ERROR        0x0     /* unwind the stack (longjmp) */
 363 #define KSH_RETURN_ERROR        0x1     /* return 1/0 for success/failure */
 364 #define KSH_IGNORE_RDONLY       0x4     /* ignore the read-only flag */
 365
 366 #include "shf.h"
 367 #include "table.h"
 368 #include "tree.h"
 369 #include "expand.h"
 370 #include "lex.h"
 371
 372 /* alloc.c */
 373 Area *  ainit(Area *);
 374 void    afreeall(Area *);
 375 void *  alloc(size_t, Area *);
 376 void *  areallocarray(void *, size_t, size_t, Area *);
 377 void *  aresize(void *, size_t, Area *);
 378 void    afree(void *, Area *);
 379 /* c_ksh.c */
 380 int     c_cd(char **);
 381 int     c_pwd(char **);
 382 int     c_print(char **);
 383 int     c_whence(char **);
 384 int     c_command(char **);
 385 int     c_type(char **);
 386 int     c_typeset(char **);
 387 int     c_alias(char **);
 388 int     c_unalias(char **);
 389 int     c_let(char **);
 390 int     c_jobs(char **);
 391 int     c_fgbg(char **);
 392 int     c_kill(char **);
 393 void    getopts_reset(int);
 394 int     c_getopts(char **);
 395 int     c_bind(char **);
 396 /* c_sh.c */
 397 int     c_label(char **);
 398 int     c_shift(char **);
 399 int     c_umask(char **);
 400 int     c_dot(char **);
 401 int     c_wait(char **);
 402 int     c_read(char **);
 403 int     c_eval(char **);
 404 int     c_trap(char **);
 405 int     c_brkcont(char **);
 406 int     c_exitreturn(char **);
 407 int     c_set(char **);
 408 int     c_unset(char **);
 409 int     c_ulimit(char **);
 410 int     c_times(char **);
 411 int     timex(struct op *, int, volatile int *);
 412 void    timex_hook(struct op *, char ** volatile *);
 413 int     c_exec(char **);
 414 int     c_builtin(char **);
 415 /* c_test.c */
 416 int     c_test(char **);
 417 /* edit.c: most prototypes in edit.h */
 418 void    x_init(void);
 419 int     x_read(char *, size_t);
 420 void    set_editmode(const char *);
 421 /* emacs.c: most prototypes in edit.h */
 422 int     x_bind(const char *, const char *, int, int);
 423 /* eval.c */
 424 char *  substitute(const char *, int);
 425 char ** eval(char **, int);
 426 char *  evalstr(char *cp, int);
 427 char *  evalonestr(char *cp, int);
 428 char    *debunk(char *, const char *, size_t);
 429 void    expand(char *, XPtrV *, int);
 430 int     glob_str(char *, XPtrV *, int);
 431 /* exec.c */
 432 int     execute(struct op * volatile, volatile int, volatile int *);
 433 int     shcomexec(char **);
 434 struct tbl * findfunc(const char *, unsigned int, int);
 435 int     define(const char *, struct op *);
 436 void    builtin(const char *, int (*)(char **));
 437 struct tbl *    findcom(const char *, int);
 438 void    flushcom(int);
 439 char *  search(const char *, const char *, int, int *);
 440 int     search_access(const char *, int, int *);
 441 int     pr_menu(char *const *);
 442 int     pr_list(char *const *);
 443 /* expr.c */
 444 int     evaluate(const char *, int64_t *, int, bool);
 445 int     v_evaluate(struct tbl *, const char *, volatile int, bool);
 446 /* history.c */
 447 void    init_histvec(void);
 448 void    hist_init(Source *);
 449 void    hist_finish(void);
 450 void    histsave(int, const char *, int);
 451 int     c_fc(char **);
 452 void    sethistcontrol(const char *);
 453 void    sethistsize(int);
 454 void    sethistfile(const char *);
 455 char ** histpos(void);
 456 int     histnum(int);
 457 int     findhist(int, int, const char *, int);
 458 int     findhistrel(const char *);
 459 char  **hist_get_newest(int);
 460
 461 /* io.c */
 462 void    errorf(const char *, ...)
 463             __attribute__((__noreturn__, __format__ (printf, 1, 2)));
 464 void    warningf(bool, const char *, ...)
 465             __attribute__((__format__ (printf, 2, 3)));
 466 void    bi_errorf(const char *, ...)
 467             __attribute__((__format__ (printf, 1, 2)));
 468 void    internal_errorf(const char *, ...)
 469             __attribute__((__noreturn__, __format__ (printf, 1, 2)));
 470 void    internal_warningf(const char *, ...)
 471             __attribute__((__format__ (printf, 1, 2)));
 472 void    error_prefix(int);
 473 void    shellf(const char *, ...)
 474             __attribute__((__format__ (printf, 1, 2)));
 475 void    shprintf(const char *, ...)
 476             __attribute__((__format__ (printf, 1, 2)));
 477 #ifdef KSH_DEBUG
 478 void    kshdebug_init_(void);
 479 void    kshdebug_printf_(const char *, ...)
 480             __attribute__((__format__ (printf, 1, 2)));
 481 void    kshdebug_dump_(const char *, const void *, int);
 482 #endif /* KSH_DEBUG */
 483 int     can_seek(int);
 484 void    initio(void);
 485 int     ksh_dup2(int, int, int);
 486 int     savefd(int);
 487 void    restfd(int, int);
 488 void    openpipe(int *);
 489 void    closepipe(int *);
 490 int     check_fd(char *, int, const char **);
 491 void    coproc_init(void);
 492 void    coproc_read_close(int);
 493 void    coproc_readw_close(int);
 494 void    coproc_write_close(int);
 495 int     coproc_getfd(int, const char **);
 496 void    coproc_cleanup(int);
 497 struct temp *maketemp(Area *, Temp_type, struct temp **);
 498 /* jobs.c */
 499 void    j_init(int);
 500 void    j_suspend(void);
 501 void    j_exit(void);
 502 void    j_change(void);
 503 int     exchild(struct op *, int, volatile int *, int);
 504 void    startlast(void);
 505 int     waitlast(void);
 506 int     waitfor(const char *, int *);
 507 int     j_kill(const char *, int);
 508 int     j_resume(const char *, int);
 509 int     j_jobs(const char *, int, int);
 510 int     j_njobs(void);
 511 void    j_notify(void);
 512 pid_t   j_async(void);
 513 int     j_stopped_running(void);
 514 /* mail.c */
 515 void    mcheck(void);
 516 void    mcset(int64_t);
 517 void    mbset(char *);
 518 void    mpset(char *);
 519 /* main.c */
 520 int     include(const char *, int, char **, int);
 521 int     command(const char *, int);
 522 int     shell(Source *volatile, int volatile);
 523 void    unwind(int) __attribute__((__noreturn__));
 524 void    newenv(int);
 525 void    quitenv(struct shf *);
 526 void    cleanup_parents_env(void);
 527 void    cleanup_proc_env(void);
 528 /* misc.c */
 529 void    setctypes(const char *, int);
 530 void    initctypes(void);
 531 char *  u64ton(uint64_t, int);
 532 char *  str_save(const char *, Area *);
 533 char *  str_nsave(const char *, int, Area *);
 534 int     option(const char *);
 535 char *  getoptions(void);
 536 void    change_flag(enum sh_flag, int, int);
 537 int     parse_args(char **, int, int *);
 538 int     getn(const char *, int *);
 539 int     bi_getn(const char *, int *);
 540 int     gmatch(const char *, const char *, int);
 541 int     has_globbing(const char *, const char *);
 542 const unsigned char *pat_scan(const unsigned char *, const unsigned char *,
 543     int);
 544 void    qsortp(void **, size_t, int (*)(const void *, const void *));
 545 int     xstrcmp(const void *, const void *);
 546 void    ksh_getopt_reset(Getopt *, int);
 547 int     ksh_getopt(char **, Getopt *, const char *);
 548 void    print_value_quoted(const char *);
 549 void    print_columns(struct shf *, int, char *(*)(void *, int, char *, int),
 550     void *, int, int prefcol);
 551 int     strip_nuls(char *, int);
 552 int     blocking_read(int, char *, int);
 553 int     reset_nonblock(int);
 554 char    *ksh_get_wd(char *, int);
 555 /* path.c */
 556 int     make_path(const char *, const char *, char **, XString *, int *);
 557 void    simplify_path(char *);
 558 char    *get_phys_path(const char *);
 559 void    set_current_wd(char *);
 560 /* syn.c */
 561 void    initkeywords(void);
 562 struct op * compile(Source *);
 563 /* trap.c */
 564 void    inittraps(void);
 565 void    alarm_init(void);
 566 Trap *  gettrap(const char *, int);
 567 void    trapsig(int);
 568 void    intrcheck(void);
 569 int     fatal_trap_check(void);
 570 int     trap_pending(void);
 571 void    runtraps(int intr);
 572 void    runtrap(Trap *);
 573 void    cleartraps(void);
 574 void    restoresigs(void);
 575 void    settrap(Trap *, char *);
 576 int     block_pipe(void);
 577 void    restore_pipe(int);
 578 int     setsig(Trap *, sig_t, int);
 579 void    setexecsig(Trap *, int);
 580 /* var.c */
 581 void    newblock(void);
 582 void    popblock(void);
 583 void    initvar(void);
 584 struct tbl *    global(const char *);
 585 struct tbl *    local(const char *, bool);
 586 char *  str_val(struct tbl *);
 587 int64_t intval(struct tbl *);
 588 int     setstr(struct tbl *, const char *, int);
 589 struct tbl *setint_v(struct tbl *, struct tbl *, bool);
 590 void    setint(struct tbl *, int64_t);
 591 int     getint(struct tbl *, int64_t *, bool);
 592 struct tbl *typeset(const char *, int, int, int, int);
 593 void    unset(struct tbl *, int);
 594 char  * skip_varname(const char *, int);
 595 char    *skip_wdvarname(const char *, int);
 596 int     is_wdvarname(const char *, int);
 597 int     is_wdvarassign(const char *);
 598 char ** makenv(void);
 599 void    change_random(void);
 600 int     array_ref_len(const char *);
 601 char *  arrayname(const char *);
 602 void    set_array(const char *, int, char **);
 603 /* vi.c: see edit.h */